diff --git a/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx b/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
index 50ce71a..0ec6c4b 100644
--- a/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
+++ b/frontend/src/components/tradeNotification/TradeSignalMiniChart.tsx
@@ -213,8 +213,9 @@ const TradeSignalMiniChart: React.FC<Props> = ({
       managerRef.current?.clearBacktestMarkers();
       return;
     }
+    if (!chartDataReady) return;
     applySignalMarkers();
-  }, [enabled, signalMarker, applySignalMarkers, barsReady]);
+  }, [enabled, signalMarker, applySignalMarkers, chartDataReady]);
 
   useEffect(() => {
     if (!enabled) return;
@@ -226,6 +227,7 @@ const TradeSignalMiniChart: React.FC<Props> = ({
         if (!canvasWrapRef.current) return;
         if (managerRef.current?.hasMainSeries()) {
           syncChartLayout();
+          applySignalMarkers();
         } else if (!chartReloadTriggeredRef.current && delay >= 600 && chartDataReady) {
           chartReloadTriggeredRef.current = true;
           setChartReloadTick(t => t + 1);
@@ -239,7 +241,7 @@ const TradeSignalMiniChart: React.FC<Props> = ({
       timers.forEach(clearTimeout);
       ro.disconnect();
     };
-  }, [market, timeframe, enabled, chartDataReady, syncChartLayout, fillHeight]);
+  }, [market, timeframe, enabled, chartDataReady, syncChartLayout, applySignalMarkers, fillHeight]);
 
   useEffect(() => {
     if (!enabled || !chartDataReady) return;
diff --git a/frontend/src/utils/tradeSignalChartMarkers.ts b/frontend/src/utils/tradeSignalChartMarkers.ts
index 899b01c..e6c3d40 100644
--- a/frontend/src/utils/tradeSignalChartMarkers.ts
+++ b/frontend/src/utils/tradeSignalChartMarkers.ts
@@ -2,6 +2,7 @@
  * 알림 목록 미니 차트 — 매매 시그널 마커
  */
 import type { ChartManager } from './ChartManager';
+import { normalizeEpochSec } from './backtestUiUtils';
 
 export interface TradeSignalChartMarker {
   candleTime: number;
@@ -46,7 +47,9 @@ export function buildNotificationSignalMarkers(
   marker: TradeSignalChartMarker | undefined,
 ): Array<{ time: number; type: string; price: number }> {
   if (!marker || !Number.isFinite(marker.price) || marker.price <= 0) return [];
-  const time = resolveSignalMarkerBarTime(mgr, marker.candleTime);
+  const candleTimeSec = normalizeEpochSec(marker.candleTime);
+  if (candleTimeSec <= 0) return [];
+  const time = resolveSignalMarkerBarTime(mgr, candleTimeSec);
   if (time == null) return [];
   return [{ time, type: marker.signalType, price: marker.price }];
 }
@@ -56,10 +59,15 @@ export function applyNotificationSignalMarkers(
   marker: TradeSignalChartMarker | undefined,
   showPrice = false,
 ): void {
-  const signals = buildNotificationSignalMarkers(mgr, marker);
-  if (signals.length === 0) {
+  if (!marker) {
     mgr.clearBacktestMarkers();
     return;
   }
+  // 차트·캔들 미준비 시 조기 clearBacktestMarkers() 호출 금지 (레이아웃/지표 로드 레이스)
+  if (!mgr.hasMainSeries() || mgr.getRawBarsLength() < 2) return;
+
+  const signals = buildNotificationSignalMarkers(mgr, marker);
+  if (signals.length === 0) return;
+
   mgr.setBacktestMarkers(signals, showPrice);
 }